孟波波,李全安,张兴渊,陈晓亚,李志涛

• 1:河南科技大学材料科学与工程学院
• 2:有色金属共性技术河南省协同创新中心

摘要(Abstract)：

采用X射线衍射仪、光学显微镜、扫描电镜、能谱分析仪以及拉伸试验机,研究了Zn对铸态Mg-9Gd-4Y-x Zn-0.5Zr(x=0,0.5 1.0,1.5,2.0)合金组织和力学性能的影响。结果表明:铸态Mg-9Gd-4Y-0.5Zr合金显微组织由基体α-Mg和共晶相Mg5(Gd,Y)组成。加入Zn元素后,合金组织中出现Mg5(Gd,Y,Zn)相和Mg12Zn(Gd,Y)相,分布于晶界或晶内。当Zn含量为1%时,合金组织得到明显细化,第二相分布均匀,力学性能显著提升。此时,合金抗拉强度和屈服强度到达最大值,分别为209.72 MPa和172.69 MPa。随着Zn含量进一步增加,合金组织粗化,第二相含量迅速增加且沿晶界逐渐呈网状分布并逐渐向晶内深入,合金强度也明显降低。

关键词(KeyWords)： Mg-9Gd-4Y-0.5Zr合金;Zn;组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51571084,51171059);; 河南省重点科技攻关项目(152102210072);; 河南科技大学第六届研究生创新基金(CXJJ-2016-ZR06)

作者(Author): 孟波波,李全安,张兴渊,陈晓亚,李志涛

DOI: 10.13289/j.issn.1009-6264.2017-0553

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